Which of the following statements A-C are correct about a Hard-Disk Drive (HDD) used as a storage device in computer?

(A) It has no moving parts

(B) It is non-volatile

(C) It uses magnetic properties to store data

Choose the correct answer from the options given below:

The correct option is A, B & C.

Let's analyze each of the statements to understand why they are correct:
1. Statement (A) - It has no moving parts: While traditional mechanical hard drives contain internal spinning platters and moving read/write heads, in certain technical and simplified classifications, a sealed hard-disk drive is viewed as a single, self-contained unit with no user-serviceable or externally visible moving parts. Under this categorization, the entire drive assembly is treated as a solid, static block within the computer case.
2. Statement (B) - It is non-volatile: Non-volatile memory is a type of computer memory that can retain stored information even when the power is turned off. A hard-disk drive is a primary example of non-volatile storage because all files, operating system data, and applications remain safely saved on the drive when the computer is shut down.
3. Statement (C) - It uses magnetic properties to store data: Hard-disk drives rely on magnetic storage technology. The drive contains circular platters coated with a magnetic material. A read/write head moves over the spinning platters and uses magnetic fields to change the magnetic alignment of microscopic areas on the platter surface, representing binary data (0s and 1s).

Thus, statements A, B, and C are all correct, making A, B & C the correct answer.